Q1：下载图片，文档
--1：Fileio.html
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
<p>
<a href="Download?filename=images/猴哥.jpg">下载猴哥0</a><br /> <a
href="Download?filename=images/pic(10).jpg">下载图片1</a><br /> <a
href="Download?filename=images/pic(11).jpg">下载图片2</a><br /> <a
href="Download?filename=images/pic(12).jpg">下载图片3</a>
</p>
<p>
<a href="Download?filename=LICENSE.txt">下载文本</a>
</p>
</body>
</html>
-2:servlet(Download)
package com.action; import java.io.FileInputStream; import java.io.IOException; import java.io.InputStream; import java.net.URLEncoder; import javax.servlet.ServletException; import javax.servlet.annotation.WebServlet; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; @WebServlet("/Download") public class Download extends HttpServlet { private static final long serialVersionUID = 1L; public Download() { super(); } protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String filename = request.getParameter("filename"); request.setCharacterEncoding("utf-8"); response.setCharacterEncoding("utf-8"); //获得要下载的文件路径 String path=getServletContext().getRealPath(filename); System.out.println(path); //获得文件名 //H:workspace.metadata.pluginsorg.eclipse.wst.server.core mp0wtpwebappsAjaxResultimages12.jpg String name=path.substring(path.lastIndexOf("\")+1); //转码 name=URLEncoder.encode(name,"utf-8"); //修改http头部，设置输出为附件 response.setHeader("Content-Disposition", "attachment;filename="+name); //输入流，获得文件的字节流 InputStream is=new FileInputStream(path); byte[] bytes=new byte[is.available()]; is.read(bytes); //将字节流写入response中 response.getOutputStream().write(bytes); is.close(); response.flushBuffer(); response.getOutputStream().flush(); } }
--点击下载时
提示：本文的最后会有java编译器图片附上
Q2：Excel导出的第一种方式，也是比较简单的一种方式
1.html用上面的就好，只是加了一点代码
<P>
<a href="DownloadXLS">导出xls</a>
</P>
2:servlet(DownloadXLS)--此方法用于不连接数据库操作
package com.action; import java.io.IOException; import java.net.URLEncoder; import javax.servlet.ServletException; import javax.servlet.annotation.WebServlet; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; @WebServlet("/DownloadXLS") public class DownloadXLS extends HttpServlet { private static final long serialVersionUID = 1L; public DownloadXLS() { super(); } protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String filename = request.getParameter("filename"); request.setCharacterEncoding("utf-8"); response.setCharacterEncoding("utf-8"); // 写入bom头 byte[] uft8bom={(byte)0xef,(byte)0xbb,(byte)0xbf}; String name=URLEncoder.encode("月度收入报表.csv","utf-8"); //修改http头部，设置输出为附件 response.setHeader("Content-Disposition", "attachment;filename="+name); String result="日期,收入 "; for (int i = 1; i <=10; i++) { result+="2018-06-"+i+","+(i*10)+"万 "; } result=new String(result.getBytes(),"utf-8"); //将字节流写入response中 response.getOutputStream().write(uft8bom); //写入头部解决乱码问题 response.getOutputStream().write(result.getBytes("utf-8")); response.flushBuffer(); response.getOutputStream().flush(); } }
3:servlet(DownloadXLS)--此方法用于连接数据库操作
package com.action; import java.io.IOException; import java.net.URLEncoder; import java.util.List; import javax.servlet.ServletException; import javax.servlet.annotation.WebServlet; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import com.bos.Menuboimpl; import com.vos.Menu; @WebServlet("/DownloadXLS") public class DownloadXLS extends HttpServlet { private static final long serialVersionUID = 1L; public DownloadXLS() { super(); } protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String filename = request.getParameter("filename"); request.setCharacterEncoding("utf-8"); response.setCharacterEncoding("utf-8"); response.setContentType("application/vnd.ms-excel");//此处我是用了火狐浏览器，这句话非常重要,下面会有介绍 // 写入bom头 byte[] uft8bom={(byte)0xef,(byte)0xbb,(byte)0xbf}; String name=URLEncoder.encode("月度收入报表.csv","utf-8"); //修改http头部，设置输出为附件 response.setHeader("Content-Disposition", "attachment;filename="+name); String result="编号,类型,名称,价格,状态,折扣,日期 "; Menuboimpl mi=new Menuboimpl(); int mmtid=Integer.parseInt(request.getParameter("mmtid")); System.out.println(mmtid); //int mmtid=1; List<Menu> list=null; if(mmtid==0) { list=mi.getMenuAllListAll(); }else { list=mi.getMenuAllList(mmtid); } for(Menu item:list) { result+=item.getMid()+","+item.getMmtid()+","+item.getMname()+","+item.getMprice()+","+ item.getStatus()+","+item.getMdiscount()+","+item.getMdate()+" "; } result=new String(result.getBytes("utf-8"),"utf-8"); //将字节流写入response中 response.getOutputStream().write(uft8bom); //写入头部解决乱码问题 response.getOutputStream().write(result.getBytes("utf-8")); response.flushBuffer(); response.getOutputStream().flush(); } }
获取数据的来源大家应该都会了
上面的那句话不同浏览器可能会有不同
按照内容类型排列的 Mime 类型列表
| 类型/子类型 | 扩展名 |
|---|---|
| application/envoy | evy |
| application/fractals | fif |
| application/futuresplash | spl |
| application/hta | hta |
| application/internet-property-stream | acx |
| application/mac-binhex40 | hqx |
| application/msword | doc |
| application/msword | dot |
| application/octet-stream | * |
| application/octet-stream | bin |
| application/octet-stream | class |
| application/octet-stream | dms |
| application/octet-stream | exe |
| application/octet-stream | lha |
| application/octet-stream | lzh |
| application/oda | oda |
| application/olescript | axs |
| application/pdf | |
| application/pics-rules | prf |
| application/pkcs10 | p10 |
| application/pkix-crl | crl |
| application/postscript | ai |
| application/postscript | eps |
| application/postscript | ps |
| application/rtf | rtf |
| application/set-payment-initiation | setpay |
| application/set-registration-initiation | setreg |
| application/vnd.ms-excel | xla |
| application/vnd.ms-excel | xlc |
| application/vnd.ms-excel | xlm |
| application/vnd.ms-excel | xls |
| application/vnd.ms-excel | xlt |
| application/vnd.ms-excel | xlw |
| application/vnd.ms-outlook | msg |
| application/vnd.ms-pkicertstore | sst |
| application/vnd.ms-pkiseccat | cat |
| application/vnd.ms-pkistl | stl |
| application/vnd.ms-powerpoint | pot |
| application/vnd.ms-powerpoint | pps |
| application/vnd.ms-powerpoint | ppt |
| application/vnd.ms-project | mpp |
| application/vnd.ms-works | wcm |
| application/vnd.ms-works | wdb |
| application/vnd.ms-works | wks |
| application/vnd.ms-works | wps |
| application/winhlp | hlp |
| application/x-bcpio | bcpio |
| application/x-cdf | cdf |
| application/x-compress | z |
| application/x-compressed | tgz |
| application/x-cpio | cpio |
| application/x-csh | csh |
| application/x-director | dcr |
| application/x-director | dir |
| application/x-director | dxr |
| application/x-dvi | dvi |
| application/x-gtar | gtar |
| application/x-gzip | gz |
| application/x-hdf | hdf |
| application/x-internet-signup | ins |
| application/x-internet-signup | isp |
| application/x-iphone | iii |
| application/x-javascript | js |
| application/x-latex | latex |
| application/x-msaccess | mdb |
| application/x-mscardfile | crd |
| application/x-msclip | clp |
| application/x-msdownload | dll |
| application/x-msmediaview | m13 |
| application/x-msmediaview | m14 |
| application/x-msmediaview | mvb |
| application/x-msmetafile | wmf |
| application/x-msmoney | mny |
| application/x-mspublisher | pub |
| application/x-msschedule | scd |
| application/x-msterminal | trm |
| application/x-mswrite | wri |
| application/x-netcdf | cdf |
| application/x-netcdf | nc |
| application/x-perfmon | pma |
| application/x-perfmon | pmc |
| application/x-perfmon | pml |
| application/x-perfmon | pmr |
| application/x-perfmon | pmw |
| application/x-pkcs12 | p12 |
| application/x-pkcs12 | pfx |
| application/x-pkcs7-certificates | p7b |
| application/x-pkcs7-certificates | spc |
| application/x-pkcs7-certreqresp | p7r |
| application/x-pkcs7-mime | p7c |
| application/x-pkcs7-mime | p7m |
| application/x-pkcs7-signature | p7s |
| application/x-sh | sh |
| application/x-shar | shar |
| application/x-shockwave-flash | swf |
| application/x-stuffit | sit |
| application/x-sv4cpio | sv4cpio |
| application/x-sv4crc | sv4crc |
| application/x-tar | tar |
| application/x-tcl | tcl |
| application/x-tex | tex |
| application/x-texinfo | texi |
| application/x-texinfo | texinfo |
| application/x-troff | roff |
| application/x-troff | t |
| application/x-troff | tr |
| application/x-troff-man | man |
| application/x-troff-me | me |
| application/x-troff-ms | ms |
| application/x-ustar | ustar |
| application/x-wais-source | src |
| application/x-x509-ca-cert | cer |
| application/x-x509-ca-cert | crt |
| application/x-x509-ca-cert | der |
| application/ynd.ms-pkipko | pko |
| application/zip | zip |
| audio/basic | au |
| audio/basic | snd |
| audio/mid | mid |
| audio/mid | rmi |
| audio/mpeg | mp3 |
| audio/x-aiff | aif |
| audio/x-aiff | aifc |
| audio/x-aiff | aiff |
| audio/x-mpegurl | m3u |
| audio/x-pn-realaudio | ra |
| audio/x-pn-realaudio | ram |
| audio/x-wav | wav |
| image/bmp | bmp |
| image/cis-cod | cod |
| image/gif | gif |
| image/ief | ief |
| image/jpeg | jpe |
| image/jpeg | jpeg |
| image/jpeg | jpg |
| image/pipeg | jfif |
| image/svg+xml | svg |
| image/tiff | tif |
| image/tiff | tiff |
| image/x-cmu-raster | ras |
| image/x-cmx | cmx |
| image/x-icon | ico |
| image/x-portable-anymap | pnm |
| image/x-portable-bitmap | pbm |
| image/x-portable-graymap | pgm |
| image/x-portable-pixmap | ppm |
| image/x-rgb | rgb |
| image/x-xbitmap | xbm |
| image/x-xpixmap | xpm |
| image/x-xwindowdump | xwd |
| message/rfc822 | mht |
| message/rfc822 | mhtml |
| message/rfc822 | nws |
| text/css | css |
| text/h323 | 323 |
| text/html | htm |
| text/html | html |
| text/html | stm |
| text/iuls | uls |
| text/plain | bas |
| text/plain | c |
| text/plain | h |
| text/plain | txt |
| text/richtext | rtx |
| text/scriptlet | sct |
| text/tab-separated-values | tsv |
| text/webviewhtml | htt |
| text/x-component | htc |
| text/x-setext | etx |
| text/x-vcard | vcf |
| video/mpeg | mp2 |
| video/mpeg | mpa |
| video/mpeg | mpe |
| video/mpeg | mpeg |
| video/mpeg | mpg |
| video/mpeg | mpv2 |
| video/quicktime | mov |
| video/quicktime | qt |
| video/x-la-asf | lsf |
| video/x-la-asf | lsx |
| video/x-ms-asf | asf |
| video/x-ms-asf | asr |
| video/x-ms-asf | asx |
| video/x-msvideo | avi |
| video/x-sgi-movie | movie |
| x-world/x-vrml | flr |
| x-world/x-vrml | vrml |
| x-world/x-vrml | wrl |
| x-world/x-vrml | wrz |
| x-world/x-vrml | xaf |
| x-world/x-vrml |
Q3：Excel导出的第二种方式
此方法需要导入几个架包，需要的联系我，我把压缩包发给你
具体是哪一个我也不太清楚，所以我就全部导入了
--第一个类(Util)，这个类用余测试数据，没有数据库连接
package ExcelUtil; import java.io.File; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import org.apache.poi.hssf.usermodel.HSSFCell; import org.apache.poi.hssf.usermodel.HSSFRow; import org.apache.poi.hssf.usermodel.HSSFSheet; import org.apache.poi.hssf.usermodel.HSSFWorkbook; import org.junit.Test; public class Util { public static void main(String[] args) throws Exception { //writIntoExcel(); testReadExcel(); } public static void writIntoExcel(){ /** * 注意这只是07版本以前的做法对应的excel文件的后缀名为.xls * 07版本和07版本以后的做法excel文件的后缀名为.xlsx */ //创建新工作簿 HSSFWorkbook workbook = new HSSFWorkbook(); //新建工作表 HSSFSheet sheet = workbook.createSheet("hello"); //创建行,行号作为参数传递给createRow()方法,第一行从0开始计算 HSSFRow row = sheet.createRow(0); //创建单元格,row已经确定了行号,列号作为参数传递给createCell(),第一列从0开始计算 HSSFCell cell = row.createCell(2); //设置单元格的值,即C1的值(第一行,第三列) cell.setCellValue("hello china"); //输出到磁盘中 FileOutputStream fos; try { fos = new FileOutputStream(new File("D:11.xls")); workbook.write(fos); workbook.close(); fos.close(); System.out.println("写入成功!"); } catch (FileNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } @Test public static void testReadExcel() throws Exception { //创建输入流 FileInputStream fis = new FileInputStream(new File("D:11.xls")); //通过构造函数传参 HSSFWorkbook workbook = new HSSFWorkbook(fis); //获取工作表 HSSFSheet sheet = workbook.getSheetAt(0); //获取行,行号作为参数传递给getRow方法,第一行从0开始计算 HSSFRow row = sheet.getRow(0); //获取单元格,row已经确定了行号,列号作为参数传递给getCell,第一列从0开始计算 HSSFCell cell = row.getCell(2); //设置单元格的值,即C1的值(第一行,第三列) String cellValue = cell.getStringCellValue(); System.out.println("第一行第三列的值是"+cellValue); workbook.close(); fis.close(); } }
--第二个类(ExcelControl)，这个类可以连接数据库
package ExcelUtil; import java.io.FileOutputStream; import java.util.List; import org.apache.poi.hssf.usermodel.HSSFCell; import org.apache.poi.hssf.usermodel.HSSFCellStyle; import org.apache.poi.hssf.usermodel.HSSFRow; import org.apache.poi.hssf.usermodel.HSSFSheet; import org.apache.poi.hssf.usermodel.HSSFWorkbook; import org.apache.poi.ss.usermodel.HorizontalAlignment; import dao.UinfoDao; import vo.uinfo; public class ExcelControl { /** * @功能：手工构建一个简单格式的Excel */ /*private static List<uinfo> getMember() throws Exception { List list = new ArrayList(); SimpleDateFormat df = new SimpleDateFormat("yyyy-mm-dd"); //javabean 实体类 uinfo user1 = new uinfo(1,"1998-05-13","男","广东韶关"); uinfo user2 = new uinfo(2,"1999-10-13","女","广东珠海"); uinfo user3 = new uinfo(3,"2000-07-13","男","广东广州"); list.add(user1); list.add(user2); list.add(user3); return list; } */ private static UinfoDao uinfodao=new UinfoDao(); public static List<uinfo> getMember(){ List<uinfo>list=uinfodao.getAllUinfo(); return list; } public static void main(String[] args) throws Exception { // 第一步，创建一个webbook，对应一个Excel文件 HSSFWorkbook wb = new HSSFWorkbook(); // 第二步，在webbook中添加一个sheet,对应Excel文件中的sheet HSSFSheet sheet = wb.createSheet("信息表一"); // 第三步，在sheet中添加表头第0行,注意老版本poi对Excel的行数列数有限制short HSSFRow row = sheet.createRow((int) 0); // 第四步，创建单元格，并设置值表头 设置表头居中 HSSFCellStyle style = wb.createCellStyle(); style.setAlignment(HorizontalAlignment.CENTER);// 创建一个居中格式 HSSFCell cell = row.createCell((short) 0); cell.setCellValue("编号"); cell.setCellStyle(style); cell = row.createCell((short) 1); cell.setCellValue("出生日期"); cell.setCellStyle(style); cell = row.createCell((short) 2); cell.setCellValue("性别"); cell.setCellStyle(style); cell = row.createCell((short) 3); cell.setCellValue("籍贯"); cell.setCellStyle(style); // 第五步，写入实体数据 实际应用中这些数据从数据库得到， List list = ExcelControl.getMember(); for (int i = 0; i < list.size(); i++) { row = sheet.createRow((int) i + 1); uinfo info = (uinfo) list.get(i); // 第四步，创建单元格，并设置值 row.createCell((short) 0).setCellValue((double) info.getUid()); row.createCell((short) 1).setCellValue(info.getUsex()); row.createCell((short) 2).setCellValue((String)info.getUbirthday()); row.createCell((short) 3).setCellValue(info.getUaddress()); //cell.setCellValue(new SimpleDateFormat("yyyy-mm-dd").format(info.getUaddress())); } // 第六步，将文件存到指定位置 try { FileOutputStream fout = new FileOutputStream("C:\Users\one\Desktop\Members.xls"); wb.write(fout); fout.close(); System.out.println("写入成功!"); } catch (Exception e) { e.printStackTrace(); } } }
--上面从数据库读取文件就需要各位自己弄了，大家把代码好好看看就明白了